CC: Toby31's CraftOS

function wait(seconds, event)
  local waitdelay = os.startTimer(seconds)
  local chk, p1, p2, p3;
  repeat chk, p1, p2, p3 = os.pullEvent() until (event ~= nil and chk == event) or (chk == "timer" and p1 == waitdelay)
  return chk, p1, p2, p3
end

term.clear()
term.setCursorPos(1,1)
textutils.slowPrint("Running Startup Program...")
wait(1)

term.setCursorPos(1,1)
term.clearLine()
print("Running Startup Program..")
wait(1)

term.setCursorPos(1,1)
term.clearLine()
print("Running Startup Program...")
wait(1)

term.setCursorPos(1,1)
term.clearLine()
print("Running Startup Program..")
wait(1)

term.setCursorPos(1,1)
term.clearLine()
print("Running Startup Program...")
wait(1)

textutils.slowPrint("Processing Scripts...")
wait(1)

term.setCursorPos(1,2)
term.clearLine()
print("Processing Scripts..")
wait(1)

term.setCursorPos(1,2)
term.clearLine()
print("Processing Scripts...")
wait(1)

totalbytes = 3250187
local count = 0

repeat
  count = count + 325000
  print("Bytes Loaded: " .. count)
  wait(0.001)
until count >= totalbytes

textutils.slowPrint("35 folders detected.")
wait(2)

textutils.slowPrint("491 initial files loaded.")
wait(2)

textutils.slowPrint("Loading user made programs.")
wait(1)

textutils.slowPrint("Loading startup screen")
wait(1)

term.clear()
pos1 = 30
term.setCursorPos(pos1, 9)

countt = 0
repeat
  term.setCursorPos(pos1, 9)
  print("-")
  pos1 = pos1 - 1
  wait(0.5)
until pos1 == 18

term.clearLine()
term.setCursorPos(1,6)
print([[
    _____          _____  ____  ____
   / ___/______ _/ _/ /_/ __ \/ __/
  / /__/ __/ _  / _/ __/ /_/ /\ \
  \___/_/  \_,_/_/ \__/\____/___/
       / /  ___  ___ ____/ /__ ___/ /
      / /__/ _ \/ _  / _  / -_) _  /
     /____/\___/\_,_/\_,_/\__/\_,_/

]])

wait(3)
Admin = "Admin"
Apass = "Password"
User = "User"
Upass = "Password"

shell.run("clear")
term.clear()
term.setCursorPos(1,1)
term.setCursorPos(1,6)
print([[
    _____          _____  ____  ____
   / ___/______ _/ _/ /_/ __ \/ __/
  / /__/ __/ _  / _/ __/ /_/ /\ \
  \___/_/  \_,_/_/ \__/\____/___/

 ]])
print ("ComputerCraft 1.4")
print("------------------------")
-- Height, 18
-- Width, 50
print("Computer Users Enter Password")
print("User:Admin")
print("User:User")
status, input = pcall (read)
if input == Admin then
  print "Password:"
  status, password = pcall (read,'*')
  if password == Apass then
    print "Access Granted!"
    sleep(2)
    shell.run("cd","Admin")
    shell.run("clear")
    wait(3)

    term.clear()
    term.setCursorPos(1,1)
    term.setCursorPos(1,6)

    print([[
    _____          _____  ____  ____
   / ___/______ _/ _/ /_/ __ \/ __/
  / /__/ __/ _  / _/ __/ /_/ /\ \
  \___/_/  \_,_/_/ \__/\____/___/
       / /  ___  ___ ____/ /__ ___/ /
      / /__/ _ \/ _  / _  / -_) _  /
     /____/\___/\_,_/\_,_/\__/\_,_/

    ]])
    print ("ComputerCraft 1.4")
    print("------------------------")
    -- Height, 18
    -- Width, 50
  else
  end
elseif input == User then
  print "Password:"
  status, password = pcall (read,'*')
  if password == Upass then
    print "Access Granted!"
    sleep(2)
    shell.run("cd","User")
    shell.run("clear")
  else

  end -- needed a end here
elseif input ~= Admin and input ~= User then -- to stop people bypassing your script.
  print("WrongPassword")
  sleep(3)

  term.clear()
  term.setCursorPos(1,1)
  textutils.slowPrint("ShutingDown...")
  wait(1)

  term.setCursorPos(1,1)
  term.clearLine()
  print("ShutingDown..")
  wait(1)

  term.setCursorPos(1,1)
  term.clearLine()
  print("ShutingDown...")
  wait(1)

  term.setCursorPos(1,1)
  term.clearLine()
  print("ShutingDown..")
  wait(1)

  term.setCursorPos(1,1)
  term.clearLine()
  print("ShutingDown...")
  wait(1)


  sleep(3)
  os.shutdown()
end